Vertiv Liebert DSE Packaged Series - Refrigerant Piping and Charging; Refrigerant Charge Requirements for Air Cooled Systems

3. Keep the replacement compressor sealed until installation is complete to the point that the system isolation
valves are ready to be engaged. Keep exposure of the POE oil in compressor to atmosphere to a minimum.
4. Install replacement compressor, replace gaskets or seals on service valves, and make all connections. Replace
unloading solenoid if equipped.
5. Once the compressor is completely installed, keep isolation valves closed to the system and open to
compressor. Add dry nitrogen to compressor and check all connections for leaks. With no leaks confirmed,
evacuate the isolated compressor prior to introducing to the rest of the system.
6. When evacuating the isolated compressor volume, pull a vacuum of 500microns with no decay above
1000microns within 20minutes.
Once evacuation requirements of compressor are met, open the valves to open the compressor to the system.
7. Check compressor and system operation. Make any necessary adjustments for proper equipment operation.
8.5.9 Refrigerant Piping and Charging
WARNING! Risk of over-pressurization of the refrigeration system. Can cause explosive discharge of high-
pressure refrigerant, loss of refrigerant, environmental pollution, equipment damage, injury, or death. This
unit contains fluids and gases under high pressure. Use extreme caution when charging the refrigerant
system. Do not pressurize the system higher than the design pressure marked on the unit's nameplate.
CAUTION: Risk of excessive refrigerant line pressure. Can cause tubing and component rupture resulting in
equipment damage and personal injury. Do not close off refrigerant-line isolation valve for repairs unless a
pressure-relief valve is field- installed in the line between the isolation valve and the check valve. The
pressure-relief valve must be rated 5% to 10% higher than the system-design pressure. An increase in
ambient temperature can cause the pressure of the isolated refrigerant to rise and exceed the system-design
pressure rating (marked on the unit nameplate).
NOTE: Consult local building and plumbing codes for installation requirements of additional pressure relief devices
when isolation valves are field installed. Do not isolate any refrigerant circuits from over pressurization protection.
NOTICE
Risk of oil contamination with water. Can cause equipment damage. Refrigerant charge must be weighted into
air cooled compressorized systems before they are started. Starting digital scroll compressors without proper
refrigerant charging can cause the compressors to operate at less than 5°F (–15°C) evaporator temperature and
at less than 52 psig (358 kPa).Operation for extended periods at less than 52 psig (358 kPa) can cause
premature compressor failure.
NOTICE
Risk of improper refrigerant charging. Can cause equipment damage. Refrigerant charge must be weighted
into air-cooled compressorized systems before they are started. Starting digital scroll compressors without
proper refrigerant charging can cause the compressors to operate at less than than 5°F (–15°C) evaporator
temperature and at less than 52 psig (358 kPa). Operation for extended periods at less than 52 psig (358 kPa)
can cause premature compressor failure.
8.5.10 Refrigerant Charge Requirements for Air Cooled Systems
Table 8.1 on the facing page and Table 8.2 on the facing page provide the refrigerant charge and oil requirements for the
Liebert®DSE Packaged Solution.
Vertiv | DSE Packaged Solution Installer/User Guide
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